I am running Ubuntu 19.10 on a Lenovo ThinkPad X1 Tablet Gen 3 connected to a Lenovo Thunderbolt 3 Dock 40AF. On the dock connections, everything (Ethernet, USB, Charging) works, but only HDMI and DisplayPort connections will not.
I have tried the standard tricks of enabling and disabling the Thunderbolt access in the Gnome UI and I have also been following this tutorial. Strang thing is that
boltctl command will not yield any output. I have been looking for log files, etc. but not found anything that would give me further information.
I cannot (and also do not want to) disable the BIOS security features.
Any further input what to do?